My books show that the "acceptable" range for camber on a "B" is between 1/4 degree negative, to 1 1/4 degree positive, with the ideal setting to be 1 degree positive.
As there is no provision for camber adjustment, I would agree with Dave, (as always) and suspect either worn components, or a PO has tried to improve on his turn in.
First, get a definitive measurement of the angles, and then check for obvious things, such as shims under the shocks, or offset bushings at the control arms. If the camber numbers are the same from side to side, I would suspect that someone has deliberately altered them.
Personally, I run negative camber on the street cars, even though it does nothing for tire longevity. Only about a degree or so negative, not the 2 or 3 degrees I run on the racers. I figure the tires will age out of usefulness before I wear them out from excessive negative camber settings!
Jeff